Maybe because of this:
conf/battle/items.conf
// Required level of bNoMagicDamage before Status Changes are blocked (Golden Thief Bug card).
// For example, if left at 50. An item can give bNoMagicDamage,40;
// which reduces magic damage by 40%, but does not blocks status changes.
gtb_sc_immunity: 50
Try making it 25. :x